Guard for printing cylinders and the like



Nov. 17, 1925.

H. STUKE GUARD FOR PRINTING CYLINDERS AND THE LIKE Filed March 28, 1922 INVENTOR Patented Nov. 17,1925.

UNITED STATES 1,562,0lti

PATENT OFFIQE.

HERMAN STUKE, OF HOLLIS, NEW YORK, ASSIGNOR. BY MESNE ASSIGNMENTS, TO B. HOE AND CO., INC., OF NEW YORK, N. Y., A CORPORATION OF NEW YORK.

GUARD FOB PRINTING CYLINDERS AND THE LIKE.

Application filed March 28, 1922. Serial No. 547,396.

To all whom it may concern:

Be it known that I, HERMAN STUKE, a citizen of the United States, residing at Hollis, county of Queens, and State of New York, have invented certain new and useful Improvements in Guards for Printing Cylinders and the like, fully described and represented in the following specification and the accompanying drawings, forming a part of the same.

This invention relates to certain improvements in safety devices intended particularly for use with rinting machine cylinders.

It is the especial object of the present invention to provide a safety device so located relatively to the form and impression cylinders of a printing machine as to effectively prevent the pressman from getting his hand between running cylinders, the safety guard being mounted so that it may be readily moved out of its normal position when it is necessary for the pressman to have access between the cylinders, as for instance, when running a Web therebetween.

It is a further object of the invention to mount the guard so that when it is moved out of normal position it may be caused to contact with a switch controlling the motor driving the printing couple withwhich the guard is used so that when the guard is moved out of guard position the press will be stopped.

It is a further object of the invention to produce 'a simple and durable construction and one which can be readily manipulated to and from guarding position by a pressman without unnecessary loss of time.

With these and other objects not specifically referred to in view, the invention consists in certain novel parts, arrangements and combinations, which will be described in detail in connection with the accompanying drawing, and the novel features thereof then pointed out in the claims hereunto annexed.

In these drawings Figure 1 is a partly broken away side elevation of so much of a printing machine as is necessary for an understanding of the invention, two printing couples being illustrated and the'guard being shown in normal position.

Figure 2 is a view similar to Fig. 1, showing the guard in the position it assumes when moved to give access to the cylinders,

and the relation of the switch mechanism to the guard whereby the switch may be operated by the guard.

Figure 3 is a detail sectional plan View of one end of the guard looking in the direction of the arrow 3 in Fig. 1, showing one arrangement for mounting the guard. 1

Referring now to these drawings, the invention has been illustrated as employed with two printing couples arranged in pairs and including form cylinders 1, l and impression cylinders 2, 2, mounted on shafts 3 suitably supported in frames 4:, the form cylinders being inked by the usual rolls 5. While only two printing couples are shown, it will be understood that the guard will be provided at any desired points in the press where it may be necessary or desirable.

In the particular construction illustrated one guard is employedfor each printing couple, being shaped and located so as to lie, when in normal position, close to the periphery of both form and impression cylinders of the couple so as to guard both the cylinders. The guard will be mounted so that it can be readily moved to and from normal position, and in the best constructions, this movement will be a swinging movement. In the particular construction illustrated, the guard comprises a heavy plate of metal having. two side members, 6 and 7 which may be lntegral and form in effect a V, the sides of the V lying close to the peripheries of the form and impression cylinders. This guard plate is pivotally mounted so that it can beswung toward and from normal position on a pair of'arms 8, one of which is shown, these arms being pivoted on studs 9 secured to the side of the frames of the machine. These arms have turned ends 10 to which one side, as side 6, of the plate is secured at its outer ends, the plate thus being movable with the arms. Stops 11 are secured in the machine frame, the lower side of the arms abutting against these stops when the parts are in normal position, thus limiting the downward movement of the plate and holding it in its cor rect relation to the periphery of the printing cylinders.

In the best constructions, and in constructions where the cylinders are motor driven, means are provided whereby the plate when in its raised position will automatically cut oil? the motor so as to stop the running of the couple. In the particular construction illustrated there is provided a pair of switches of the ordinary push type marked 12, 13, mounted in the frame l, betore rei'erred to, and being in a circuit with the driving motor 130, a controlling circuit to the motor being indicated by the wires 131, 1.32, it being understood that in the move ment oi the push switches through the r-ircuit shown cuts out or stops the motmi. is transmitted from the motor to the opt. ative parts (:i' the press in any itaole manner the gearing not being show as not for an und" tan'li oi the in- ()ne oi" thes, switches as switch i'uounted so as to he opera ed by the guard used with cylinders l. the other switch 11% is mounted so as to be operated by the guard employed with cylinders l and 2. he guard is thrown to r sed position, as ted in Fig. 2, the e- :s oi the plates contact with the switches and throws the motor out, thus stop 'iing the operation of the couples.

With this construction the pressman may readily and quickly, without loss of time, raise or lower the guard, it being unnecessary to unt'asten the guard in any way, the guard being simply swung on its pivot. At the same time the swinging il'lOVQIYlGYlt oi the guard operates the push switches and throws oii' the motor and automatically stops the running of the press until the pressman again manipulates the switches to throw the motor .in, at'ter the guard has been swung down. With this construction, therefore, the pressinan is well guarded from injury and does not have to lose any time in manipulating the guard.

lVhile the invention has been shown in its best form, it willv be understood that certain changes and variations in the form of the guard and means for mounting it in operative relation of the press cylinders may be employed without departing from the invention. It will also be understood that the guard may be employed without the use of the throwout switches, but the use o1 the switch construction is preferableand will beadopted in the best structures where motor or other electric drives are used for driving the press mechanism.

What I claim is 1. The combination with a pair of rolls, of

a piyota-lly mounted guard normally extendpose-d faces lying closely adjacent the pe-- ripheries ot the rolls.

2. The combination with a pair of rolls, of a pivotally supported; guard, said guard including a plate having angularly disposed 'l'aces extending between the rolls and adjacent the peripheries thereof, and a stop for liniitin the movement otthe guard toward the rods.

'lit'e combination with a pair of rolls, ct ard including a plate having a pair oi z "y disposed tacos normally extendin adjacent the peripheries of the rolls, and widthwise thereof pivoted arms on which the plate is carried, and a stop for limiting the movement of the arms.

The combination with a pair of rolls, of a pivoted guard mountedto lie closely adjacent the roll surfaces for preventing the hands 01 an operator from being caught therehet ween, said. guard-haying a swinging movement to and from the rolls, and a cir cuit controller actuated by the Contact of the guard there vith in its movement away from the rolls.

0. The combination with a pair of adjacent rolls, ot a single guard comprising a plate having sides arranged to form a V,

the sides normally extending across and closely adjacent the peripheries of each roll, and means for mountingthe plate to have a movement toward and from the rolls.

6. The combinationwith a pair ofroll's the perpheries of which are closely adjacent, of a pivoted guard plate having angularly deposed sides extending between the rolls-and adjacent the peripheries thereof; a motor, a circuit therefor, and aswitclr operated by the contact of the guard therewith for cutting out the motor.

7; The-combination with a pair of cylin ders having an impression Contact with each other, a guard plate having angularlydisposed sides arranged so that it may be swung to place the sides between the cylinders and closely adjacent the peripheries HERMAN STUKE. 

